[gnome-games] runner: Add delete_savestate()

[Alexander Mikhaylenko <alexm src gnome org>]

commit 7028d9b839291172031f5abb351c137196021c37
Author: Yetizone <andreii lisita gmail com>
Date:   Thu Aug 8 16:51:39 2019 +0300

    runner: Add delete_savestate()

 src/command/command-runner.vala |  3 +++
 src/core/runner.vala            |  1 +
 src/dummy/dummy-runner.vala     |  3 +++
 src/retro/retro-runner.vala     | 12 ++++++++++++
 4 files changed, 19 insertions(+)
---
diff --git a/src/command/command-runner.vala b/src/command/command-runner.vala
index 6d5d1b94..13bd524d 100644
--- a/src/command/command-runner.vala
+++ b/src/command/command-runner.vala
@@ -106,6 +106,9 @@ public class Games.CommandRunner : Object, Runner {
                return false;
        }
 
+       public void delete_savestate (Savestate savestate) {
+       }
+
        public InputMode[] get_available_input_modes () {
                return { };
        }
diff --git a/src/core/runner.vala b/src/core/runner.vala
index 3dd47682..bd58210a 100644
--- a/src/core/runner.vala
+++ b/src/core/runner.vala
@@ -24,6 +24,7 @@ public interface Games.Runner : Object {
        public abstract void preview_savestate (Savestate savestate);
 
        public abstract bool try_create_savestate (bool is_automatic);
+       public abstract void delete_savestate (Savestate savestate);
        public abstract void load_previewed_savestate () throws Error;
        public abstract Savestate[] get_savestates ();
 
diff --git a/src/dummy/dummy-runner.vala b/src/dummy/dummy-runner.vala
index a3db95c3..86ae78b5 100644
--- a/src/dummy/dummy-runner.vala
+++ b/src/dummy/dummy-runner.vala
@@ -72,6 +72,9 @@ private class Games.DummyRunner : Object, Runner {
                return false;
        }
 
+       public void delete_savestate (Savestate savestate) {
+       }
+
        public InputMode[] get_available_input_modes () {
                return { };
        }
diff --git a/src/retro/retro-runner.vala b/src/retro/retro-runner.vala
index 457298ca..803dc165 100644
--- a/src/retro/retro-runner.vala
+++ b/src/retro/retro-runner.vala
@@ -490,6 +490,18 @@ public class Games.RetroRunner : Object, Runner {
                // FIXME: The game_savestates array should be updated somehow here
        }
 
+       public void delete_savestate (Savestate savestate) {
+               Savestate[] new_game_savestates = {};
+
+               foreach (var existing_savestate in game_savestates) {
+                       if (savestate != existing_savestate)
+                               new_game_savestates += existing_savestate;
+               }
+
+               game_savestates = new_game_savestates;
+               savestate.delete_from_disk ();
+       }
+
        private string get_options_path () throws Error {
                assert (core != null);